Hey Leanne,
Basically what you did, but the ‘1’ that endnote is inserting is significantly smaller than the corresponding text size even in superscript. So in your example the 1 would be approx. half the superscript text size. I want it to go back to how yours looks 
In mucking around I changed the font of my word doc to another font and back and it miraculously fixed itself… But I’d love to know why I had the issue in the first place
Thanks